Data/hora: 22/06/2024 04:42:03

Biblioteca(s): | Embrapa Mandioca e Fruticultura.
Data corrente: | 14/04/2004
Data da última atualização: | 14/04/2004
Autoria: | FREGENE, M.; ANGEL, F.; SUAREZ, M. C.; JANNETH, G.; CHAVARRIAGA, P.; ROCA, W. BONIERBALE, M.; TOHME, J.
Título: | Genome mapping in cassava improvement: challenges, achievements and opportunities.
Ano de publicação: | 1998
Fonte/Imprenta: | Revista Brasileira de Mandioca, Cruz das Almas, v.17, p.24, nov., 1998. Suplemento.
Idioma: | Inglês
Conteúdo: | Abstract: Breeding goals of yield increases, root quality improvement, and disease resistance in cassava are considerably slowed down by biological characteristics of the crop, which includes, a long growth cycle, a heterozygous genetic background and a poor knowledge of the organisation of crop diversity. These factors severely hamper the speed and ease of moving around useful genes in cassava. Cassava yield and root quality improvement has therefore lagged behind other major staples. The consequences are cassava production fails to keep up with demand, especially in regions where over 90% of yield is consumed as food, leading to an increases in acreage of cassava fields. mostly into marginal lands. The advent of molecular markers, genome studies and, plant transgenesis holds promise of providing ways around breeding obstacles in long growth cycle and heterozygous crops. A number of these new tools, including a molecular genetic map, markers linked to disease resistance genes, and marker-aided studies of complex traits now exist or are being developed for cassava at CIAT. They represent a new and bold approach to bridging oportunities and realities of cassava production. Large scale sequencing and mapping of expressed sequences has been initiated towards a transcript map of cassava and implementation of the candidate-gene approach to complex trait mapping. A cassava bacterial artificial chromosome (BAC) library has also been constructed to expedite gene cloning of genes, known only by their phenotypes and their position relative to markers on a molecular genetic map. Studies of genes that control traits of agronomic importance, their allelic diversity in nature, and organization of these genes at the genome level, provides powerful tools for understanding the basis of crop perfomance and improvement. Genome studies will help tailor, efficiently, cassava to fufill its traditional role , of a food security crop, filling the stomach of men and beast alike cheap affordable calories, and its modern role, of an industrial crop, feeding the industries of the world with high quality starches, and starch based products.
Categoria do assunto: | --
Registro original: | Embrapa Mandioca e Fruticultura (CNPMF)
Exemplares: | CNPMF - (20942-1) - ADD - AP - -- - 633.68205 -  -  - DIS